HD66727 Datasheet, PDF (71/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
Table 34 Correspondence between Annunciator Display Addresses (AAN) and Driver Signals
AAN Address
Segment Signal
MSB
LSB Common Signal Bits 7, 6
Bits 5, 4
Bits 3, 2
Bits 1, 0
0
0
0
0
ACOM
ASEG1
ASEG2
ASEG3
ASEG4
0
0
0
1
ACOM
ASEG5
ASEG6
ASEG7
ASEG8
0
0
1
0
ACOM
ASEG9
ASEG10
ASEG11
ASEG12
Note: The annunciator is turned on when the corresponding even bit (bit 6, 4, 2, or 0) is 1, and the turned-
on annunciator blinks when the corresponding odd bit (bit 7, 5, 3, or 1) is 1.
i) Normal mode and sleep mode
ACOM
ASEG1
ASEG2
V_CC level
V_CC level
V_CC level
ii) Standby mode (without oscillation)
EXM
(Input)
ACOM
ASEG1
V_CC level
V_CC level
V_CC level
ASEG2
AGND level
AGND level
AGND level
V_CC level
1 frame
1 frame
AGND level
AGND level
AGND level
V_CC level
V_CC level
V_CC level
Display off
AGND level
Display on
V_CC level
V_CC level
V_CC level
Display off
AGND level
Display on
Note: If annunciator display is unnecessary during standby mode, make sure to fix the EXM pin to the V_CC or GND level
and set the annunciator display ON bit (DA) to 0. This will prevent dark display and liquid-cell deterioration due to
DC bias application on liquid crystal cells.
Figure 40 Annunciator Drive Output Waveforms
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